Coating compositions

A two-part curable coating composition comprising:

• (A) a composition comprising an alkoxysilane terminated polyester urethane prepolymer, comprising a prepolymer chain having a terminal group of general formula (I):
• wherein:
• Y represents:
• H;
• R1 wherein R1 represents hydrocarbyl preferably alkyl or aryl;
• or wherein Y represents the group:
• L represents a hydrocarbylene group, preferably an alkylene or an arylene group, preferably a C1 to C10 hydrocarbylene group, and preferably methylene, ethylene, or propylene and most preferably propylene;
• W1, W2, W3, W4, W5 and W6 may be the same or different and each independently represents —OR2, wherein R2 at each occurrence may be the same or different, and each R2 is independently selected from an alkyl group, preferably wherein the alkyl group has 1 to 10 carbon atoms, and preferably wherein the alkyl group has 1 to 8 atoms, preferably methyl or ethyl, and most preferably methyl;
• and
• (B) a composition comprising a silanol terminated polysiloxane prepolymer obtainable by sol-gel process of an alkoxysilane selected from a compound of general formula (II), (III) or (IV):
• wherein:
• X1, X2, X3, X4, X5, and X6 each represents —OR3;
• R3 at each occurrence is the same or different, and each is independently selected from an alkyl group, preferably wherein the alkyl group has 1 to 10 carbon atoms, 1 to 8 atoms, 1 to 6 carbon atoms, and most preferably 1 to 4 carbon atoms;
• and
• m represents an integer from 1 to 6, preferably 1 to 3.